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CN111740620A - Power supply device and medical system - Google Patents

Power supply device and medical system Download PDF

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Publication number
CN111740620A
CN111740620A CN202010206937.XA CN202010206937A CN111740620A CN 111740620 A CN111740620 A CN 111740620A CN 202010206937 A CN202010206937 A CN 202010206937A CN 111740620 A CN111740620 A CN 111740620A
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CN
China
Prior art keywords
voltage
value
input
current
power supply
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Granted
Application number
CN202010206937.XA
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Chinese (zh)
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CN111740620B (en
Inventor
竹上荣治
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TDK Corp
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TDK Corp
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/01—Subjecting similar articles in turn to test, e.g. "go/no-go" tests in mass production; Testing objects at points as they pass through a testing station
    • G01R31/013—Testing passive components
    • G01R31/016—Testing of capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from DC input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0009—Devices or circuits for detecting current in a converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P80/00—Climate change mitigation technologies for sector-wide applications
    • Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rectifiers (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The power supply device of the invention can more accurately judge the service life of a capacitor in a power factor correction circuit part, and comprises: a power factor correction circuit unit (6) that includes a capacitor (6d) and converts an input voltage (Vi) obtained by rectifying an AC input voltage (Vac) into a DC voltage (Vo) and outputs the DC voltage (Vo); a current detection unit (5) that detects an inflow current (Ii) flowing through the power factor correction circuit unit and outputs a current detection signal (Si); an output voltage detection unit (7) that detects the DC voltage (Vo) and outputs an output voltage detection signal (Sv 2); a differential voltage detection unit (8) that detects a differential voltage value (Vdi) between the maximum value and the minimum value of the ripple component of the DC voltage (Vo) detected by the output voltage detection signal; a service life determination unit (10) which compares the differential voltage value with a comparison threshold (Vthc) and reports the service life of the capacitor when the differential voltage value reaches the comparison threshold; a threshold value update unit (9) updates the comparison threshold value to a threshold value corresponding to the current value of the inflow current (Ii) detected based on the current detection signal (Si).

Description

Power supply device and medical system
Technical Field
The present invention relates to a power supply device having a function of determining the end of life of a capacitor, and a medical system including the power supply device.
Background
As such a power supply device, the applicant of the present application has already proposed a power supply device disclosed in patent document 1 below. The power supply apparatus includes a detection unit that detects a ripple amplitude value of a DC voltage smoothed by a capacitor to be detected, and a capacitor service life determination unit that outputs an alarm signal when a detected value of the ripple amplitude detected by the detection unit exceeds a ripple limit reference value (a predetermined ripple limit reference voltage) which is a predetermined reference value, and can accurately determine the service life of the capacitor in real time in a used state, with attention paid to characteristics of the capacitor (characteristics that an increase in internal impedance and a decrease in capacity due to aging become severe and a smoothing action on the ripple attenuates and increases an amount of the DC output voltage corresponding to the ripple). In this case, the ripple limit reference voltage as the reference value is a fixed voltage that does not change after being set once. Therefore, the power supply device does not need to keep track of the ripple limit reference voltage once, and is convenient to use.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2006-133046 (pages 4-7, FIGS. 1-2)
Disclosure of Invention
Problems to be solved by the invention
However, the pulsating amount of the dc voltage smoothed by the capacitor fluctuates not only in a fluctuation that increases with the aging of the capacitor (that is, with the lapse of time) as described above, but also when the amount of current flowing through the capacitor (the amplitude of the ac current component) fluctuates (for example, when the amount of current flowing through the capacitor fluctuates due to a light or heavy fluctuation of a load to which the dc voltage is supplied from the capacitor). Therefore, in order to more accurately determine the lifetime of the capacitor, it is preferable to consider not only the former variation but also the latter variation, but in a conventional power supply device having a structure in which the reference value is a fixed value (fixed voltage), it is difficult to more accurately determine the lifetime of the capacitor.
The present invention has been made to solve the above-described problems, and a main object of the present invention is to provide a power supply device having a function of determining the lifetime of a capacitor more accurately, and a medical system including the power supply device.
Means for solving the problems
In order to achieve the above object, a power supply device of the present invention includes: a power factor correction circuit unit including an inductor, a diode, a switching element, and a capacitor, for converting an input voltage obtained by rectifying an alternating-current voltage into a direct-current voltage and outputting the direct-current voltage; a current detection unit that detects an inflow current flowing into the power factor correction circuit unit and outputs a current detection signal; an output voltage detection unit that detects the dc voltage and outputs an output voltage detection signal; a differential voltage detection unit that detects any one of a differential voltage value between a maximum value and a minimum value of a ripple component of the dc voltage detected from the output voltage detection signal, a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the maximum value and a voltage value of a target voltage of the dc voltage, and a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the minimum value and a voltage value of the target voltage; a service life determination unit that compares any one of the differential voltage values with a predetermined comparison threshold value and reports the service life of the capacitor when the differential voltage value reaches the comparison threshold value; and a threshold updating unit that updates the comparison threshold to a threshold corresponding to a current value of the inflow current detected based on the current detection signal.
Therefore, according to the power supply device, the service life determination unit compares the differential voltage value with the comparison threshold, and thus can directly compare the increase amount of the ripple component caused at the present time of the aging of the capacitor with the increase amount of the ripple component from the state in which the aging of the capacitor is not present to the time when the aging increases and reaches the service life, in a state in which the influence of the ripple component generated in the capacitor according to the variation of the inflow current is greatly reduced (in other words, almost not influenced by the ripple component generated in the capacitor according to the inflow current), and thus can more accurately detect (determine) whether or not the service life of the capacitor has been reached.
The power supply device of the present invention includes an input voltage detection unit that detects a voltage obtained by rectifying the ac voltage and outputs an input voltage detection signal, and the threshold value update unit updates the comparison threshold value to a threshold value corresponding to a voltage value of the ac voltage detected based on the input voltage detection signal, among the threshold values corresponding to current values of the inflow current existing for each voltage value of the ac voltage.
Therefore, according to this power supply device, even when an ac voltage (i.e., an input voltage) having a different voltage value is input, a new threshold (comparison threshold) can be calculated accurately in accordance with the voltage value of the ac voltage and the current value of the inflow current.
The power supply device of the present invention includes: a power factor correction circuit unit including an inductor, a diode, a switching element, and a capacitor, for converting an input voltage obtained by rectifying an alternating-current voltage into a direct-current voltage and outputting the direct-current voltage; an input voltage detection unit that detects a voltage obtained by rectifying the ac voltage and outputs an input voltage detection signal; a current detection unit that detects an inflow current flowing into the power factor correction circuit unit and outputs a current detection signal; an output voltage detection unit that detects the dc voltage and outputs an output voltage detection signal; a differential voltage detection unit that detects any one of a differential voltage value between a maximum value and a minimum value of a ripple component of the dc voltage detected from the output voltage detection signal, a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the maximum value and a voltage value of a target voltage of the dc voltage, and a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the minimum value and a voltage value of the target voltage; a service life determination unit that compares any one of the differential voltage values with a predetermined comparison threshold value and reports the service life of the capacitor when the differential voltage value reaches the comparison threshold value; and a threshold updating unit that updates the comparison threshold to a threshold corresponding to the input power calculated from a current value of the inflow current detected based on the current detection signal and a voltage value of the ac voltage detected based on the input voltage detection signal.
Therefore, according to the power supply device, the service life determination unit compares the differential voltage value with the comparison threshold, and thus can directly compare the increase amount of the ripple component caused at the present time of the aging of the capacitor with the increase amount of the ripple component from the state in which the aging of the capacitor is not present to the time when the aging increases and reaches the service life, in a state in which the influence of the ripple component generated in the capacitor according to the variation of the input power is greatly reduced (in other words, almost not influenced by the ripple component generated in the capacitor according to the input power), and thus can more accurately detect (determine) whether or not the service life of the capacitor has been reached.
In the power supply device of the present invention, the power factor correction circuit unit stops the switching operation of the switching element when the service life determination unit reports that the service life has been reached.
Therefore, according to the power supply device, the capacitor having reached the end of its service life can be prevented from being used continuously.
The medical system of the present invention includes: any one of the power supply devices described above includes a pair of input terminals connected to an input line, a primary-side rectifying unit connected to the pair of input terminals via a pair of power lines and rectifying the ac voltage input via the input line, the pair of input terminals, and the pair of power lines to output the ac voltage as the input voltage to the power factor correction circuit unit, an insulated DC/DC converter generating a load voltage from the DC voltage and outputting the load voltage to a corresponding load, and a fuse or a circuit breaker inserted in the pair of power lines; and a medical device connected to the insulated DC/DC converter as the load and operating based on the load voltage.
Therefore, according to the medical system, in the configuration including the insulation transformer in which the insulation of the insulation type DC/DC converter is strengthened, the fuse or the breaker may be further provided in the pair of power lines, and the medical standard may be obtained by a single power supply device, and therefore, the configuration capable of obtaining the medical standard may be realized without inserting the insulation transformer and the fuse (or the breaker) outside the power supply device (specifically, the input line connected to the power supply device). In addition, according to the medical system, the above-described effect of using a single power supply device can be obtained by providing the above-described power supply device.
The medical system of the present invention includes: any one of the power supply devices described above includes a pair of input terminals connected to an input line, a primary-side rectifying unit connected to the pair of input terminals and rectifying the ac voltage input through the input line and the pair of input terminals to output the ac voltage as the input voltage to the power factor correction circuit unit, and an insulated DC/DC converter that generates the DC voltage and outputs the DC voltage to a load corresponding to the load; the fuse or the breaker is inserted in the input line; and a medical device connected to the insulated DC/DC converter as the load and operating based on the load voltage.
Therefore, according to this medical system, in the configuration including the insulation transformer in which the insulation type DC/DC converter is reinforced, the fuse (or the circuit breaker) can be inserted only outside the power supply device (specifically, the input line connected to the power supply device), and thus a configuration that can obtain the medical standard can be realized. In addition, according to the medical system, the above-described effect of using a single power supply device can be obtained by providing the above-described power supply device.
The medical system of the present invention includes: any one of the power supply devices described above includes a pair of input terminals connected to an input line, a primary-side rectifying unit connected to the pair of input terminals via a pair of power lines and rectifying the ac voltage input to the input line via the input line, the pair of input terminals, and the pair of power lines to output the ac voltage as the input voltage to the power factor correction circuit unit, an insulated DC/DC converter generating a load voltage from the DC voltage and outputting the load voltage to a corresponding load, and a 1 st fuse or a 1 st circuit breaker inserted in one of the pair of power lines; a 2 nd fuse or a 2 nd circuit breaker inserted in the input line connected to the other of the pair of power lines through the input terminal; and a medical device connected to the insulated DC/DC converter as the load and operating based on the load voltage.
Therefore, according to this medical system, in the configuration including the insulation transformer in which the insulation type DC/DC converter is reinforced insulated, the 1 st fuse or the 1 st circuit breaker inserted in one power line is further provided inside, and therefore, the configuration capable of obtaining the medical standard can be realized by inserting the 2 nd fuse or the 2 nd circuit breaker only outside the power supply device (specifically, only the input line connected to the other power line among the input lines connected to the power supply device). In addition, according to the medical system, the above-described effect of using a single power supply device can be obtained by providing the above-described power supply device.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to more accurately determine whether or not the service life of the capacitor has been reached, while greatly reducing the influence of the ripple component generated in the capacitor of the power factor correction circuit unit in accordance with the variation in the input power and the inflow current.
Drawings
Fig. 1 is a configuration diagram showing a configuration of a power supply device 1A.
Fig. 2 is a waveform diagram for explaining the ripple amplitude value Vpp of the dc voltage Vo.
Fig. 3 is an explanatory diagram for explaining the relationship between the pulsation amplitude value Vpp, the input voltage Vi, the inflow current Ii, and the supplied power.
Fig. 4 is a waveform diagram for explaining the input voltage Vi and the inflow current Ii.
Fig. 5 is a configuration diagram showing the configuration of the power supply device 1B.
Fig. 6 is a configuration diagram of a medical system MES1 including the power supply device 1A.
Fig. 7 is a configuration diagram of a medical system MES2 including the power supply device 1A.
Fig. 8 is a configuration diagram of a medical system MES3 including the power supply device 1A.
Detailed Description
Hereinafter, embodiments of the power supply device and the medical system will be described with reference to the drawings.
First, a configuration of a power supply device 1A as an example of the power supply device will be described with reference to fig. 1. As an example, the power supply device 1A includes a pair of input terminals 2a and 2b, a primary-side rectifying unit 3, an input voltage detecting unit 4, a current detecting unit 5, a power factor correction circuit unit 6, an output voltage detecting unit 7, a differential voltage detecting unit 8, a threshold updating unit 9, a service life determining unit 10, an insulated DC/DC converter (hereinafter, also simply referred to as "converter") 11, a smoothing unit 12, and a pair of output terminals 13a and 13b, and converts an ac input voltage Vac input between the input terminals 2a and 2b into a DC output voltage Vout of a predetermined voltage value and outputs the DC output voltage Vout. In the power supply device 1A, a load LD (electronic equipment or the like) is connected to output terminals 13a and 13b, and a dc output voltage Vout is supplied to the load LD. In the present embodiment, the power supply device 1A is configured to include the converter 11 and the smoothing part 12, and the converter 11 and the smoothing part 12 may be provided at a stage subsequent to the power supply device 1A as a separate component from the power supply device 1A.
The pair of input terminals 2a and 2b are connected to input lines, not shown, from which an ac input voltage Vac is input. The primary-side rectifying unit 3 is connected to the input terminals 2a and 2b via a pair of power supply lines 73 and 74, full-wave rectifies an ac input voltage Vac, which is a sinusoidal signal input to the input terminals 2a and 2b, and outputs the rectified voltage as an input voltage (ripple voltage) Vi to the power factor correction circuit unit 6. Further, the primary-side rectifying unit 3 may be disposed outside the power supply device 1A, and the input voltage Vi may be directly input to the input terminals 2a and 2 b.
The input voltage detection unit 4 is provided between the primary-side rectification unit 3 and the power factor correction circuit unit 6, detects the input voltage Vi, and outputs an input voltage detection signal Sv 1. The input voltage detection signal Sv1 is, as an example, a voltage signal whose voltage value changes in proportion to the voltage value of the input voltage Vi.
The current detection unit 5 is provided between the primary-side rectifying unit 3 and the power factor correction circuit unit 6, detects a current (also referred to as an inflow current) Ii flowing into the power factor correction circuit unit 6, and outputs a current detection signal Si. The power factor correction circuit unit 6 performs a power factor correction operation described later, and causes the waveform of the inflow current Ii to follow the waveform of the input voltage Vi (pulse current waveform) as shown in fig. 4. In this example, the current detection unit 5 detects the current value of the inflow current Ii having the pulse waveform as described above, and outputs a current detection signal Si (signal having a pulse waveform) having a voltage value proportional to the current value.
The power factor correction circuit unit (PFC)6 includes a control circuit (not shown) that drives the inductor 6a, the diode 6b, the switching element 6c, the capacitor (output capacitor) 6d, and the switching element 6c, and is configured by any one of a boost-type power factor correction circuit, a buck-type power factor correction circuit, and a boost-type power factor correction circuit (in this example, a boost-type power factor correction circuit as shown in fig. 1), and converts the input voltage Vi into the dc voltage Vo and outputs the dc voltage Vo. The control circuit has an input voltage detection function, an input current detection function, and an output voltage detection function, and performs pulse width control (pulse width modulation control) of the switching element 6c based on a differential voltage between the detected dc voltage Vo and a predetermined target voltage Vtg for the dc voltage Vo, based on a voltage value of the input voltage Vi detected by the input voltage detection function, a current value of the inflow current Ii detected by the input current detection function, and a voltage value of the dc voltage Vo detected by the output voltage detection function.
The power factor correction circuit unit 6 performs the pulse width control by the control circuit, and performs a voltage stabilization operation of stabilizing the dc voltage Vo to the target voltage Vtg and a power factor correction operation of causing the waveform of the inflow current Ii (the waveform indicated by the broken line) to follow the waveform of the input voltage Vi (the waveform indicated by the thick solid line) as shown in fig. 4 in parallel. When the service life determination unit 10 outputs a report signal Sd described later, the control circuit detects the report signal Sd and stops the pulse width control (pulse width modulation control) of the switching element 6c, thereby stopping the voltage stabilization operation and the power factor correction operation of the power factor correction circuit unit 6.
The output voltage detection unit 7 is provided between the power factor correction circuit unit 6 and the converter 11, detects the dc voltage Vo, and outputs an output voltage detection signal Sv 2. The output voltage detection signal Sv2 is a voltage signal whose voltage value changes in proportion to the voltage value of the direct current voltage Vo.
In this example, the differential voltage detection unit 8 detects the amount of ripple (ripple amplitude value vpp. see fig. 2) of the dc voltage Vo smoothed by the capacitor 6d in the power factor correction circuit unit 6 based on the output voltage detection signal Sv2, and outputs the detected value as the differential voltage value Vdi. As shown in fig. 2, the ripple amplitude value Vpp is a difference voltage value between the maximum value Vpmax and the minimum value Vpmin of the ripple component (the same period as the switching period of the switching element 6 c) of the dc voltage Vo. As shown in fig. 2, the ripple amplitude value Vpp is also a difference voltage value between the voltage value Vomax of the dc voltage Vo at the timing when the ripple component becomes the maximum value Vpmax and the voltage value Vomin of the dc voltage Vo at the timing when the ripple component becomes the minimum value Vpmix, and the average value of the voltage value Vomax and the voltage value Vomin is the target voltage Vtg. Therefore, the difference voltage value (Vomax-Vtg) between the voltage value Vomax and the target voltage Vtg and the difference voltage value (Vtg-Vomin) between the voltage value Vomin and the target voltage Vtg are both 1/2 of the ripple amplitude value Vpp, and therefore are equivalent to the ripple amplitude value Vpp itself in functioning as a characteristic value (parameter value) indicating the aging (lifetime) of the capacitor 6 d. Therefore, the differential voltage detection unit 8 may be configured to detect any one of the above-described differential voltage value (Vomax-Vtg) and differential voltage value (Vtg-Vomin) and output the detected value as the differential voltage value Vdi, instead of detecting the pulsation amplitude value Vpp.
It was confirmed that the pulsation amplitude value Vpp not only increases with age of the capacitor 6d (gradually increases with time), but also fluctuates with fluctuation of the power (supplied power) supplied from the power factor correction circuit unit 6 to the subsequent circuit (increases and decreases substantially in proportion to the increase and decrease of the supplied power). This is because, as the supplied power varies, the amount of current flowing through the capacitor 6d (the amplitude of the ac current component) also varies substantially in proportion thereto. This is also shown in the simulation results shown in fig. 3. The ripple amplitude value Vpp shown in fig. 3 is a value calculated from the supplied power (or from the voltage value of the ac input voltage Vac (input voltage Vi) and the current value of the inflow current Ii). In addition, in this simulation result, even if the supplied power is the same, when the input voltage Vi (ac input voltage Vac) is different, the pulsation amplitude value Vpp is slightly different (for example, when the supplied power is 25W and the input voltage Vi is 100V, the pulsation amplitude value Vpp is 4.5V, whereas when the supplied power is 25W and the input voltage Vi is 200V, the pulsation amplitude value Vpp is 4.8V, and the like), and the difference is very small. Therefore, as described above, the pulsation amplitude value Vpp can be treated as a value that increases and decreases substantially in proportion to an increase and decrease in the supplied power, regardless of the value of the input voltage Vi (ac input voltage Vac).
Since the pulsation amplitude value Vpp is a parameter that increases and decreases substantially in proportion to the increase and decrease of the supplied power in this way, when the input voltage Vi (ac input voltage Vac) is fixed (in the example shown in fig. 3, when the input voltage Vi (ac input voltage Vac) is fixed to any one of 100V and 200V), the pulsation amplitude value Vpp varies substantially in proportion to the variation in the current value of the inflow current Ii (in the figure, the peak value Ip, and the same applies to the effective value or the average value). For example, when the input voltage Vi is 100V and the current supply power to the load LD is 50W, the pulse amplitude value Vpp also increases when the load LD is heavy from the current state and the supply power increases (when the inflow current Ii increases), and conversely, the pulse amplitude value Vpp also decreases when the load LD is light from the current state and the supply power decreases (when the inflow current Ii decreases).
The pulsation amplitude value Vpp is actually measured by the differential voltage detection unit 8, and is calculated by the threshold update unit 9 as described later. Therefore, when the pulsation amplitude value Vpp (actually measured value) of the differential voltage detection unit 8 and the pulsation amplitude value Vpp (theoretical value) of the threshold update unit 9 are distinguished from each other, the former is also referred to as a pulsation amplitude value Vpp1, and the latter is also referred to as a pulsation amplitude value Vpp 2. When the two are not particularly distinguished, the pulse amplitude value is also referred to as a pulse amplitude value Vpp.
The threshold updating section 9 detects the voltage value of the input voltage Vi (as a result, the voltage value of the ac input voltage Vac) based on the input voltage detection signal Sv1, and detects the current value of the inflow current Ii based on the current detection signal Si. The threshold updating unit 9 calculates a new threshold for updating a comparison threshold Vthc, which will be described later, used in the service life determination unit 10 based on the detected voltage value of the input voltage Vi and the current value of the inflow current Ii, and outputs the new threshold to the service life determination unit 10 as the comparison threshold Vthc.
As shown in fig. 4, the threshold updating unit 9 may detect the effective values of the input voltage Vi and the inflow current Ii, both of which are pulse signals of the period T (1/2 of the period of the ac input voltage Vac), in 1 period T as the voltage value and the current value, and may detect the voltage value and the current value at predetermined timings within 1 period T of the input voltage Vi and the inflow current Ii (specifically, the voltage value and the current value at the time when a predetermined fixed time T (< T) has elapsed from the timing of the rising edge of the waveform) instead of the configuration of detecting the average value of the effective values. In this example, the threshold updating unit 9 is configured to detect an effective value of the input voltage Vi (ac input voltage Vac) as a voltage value and a current value of the inflow current Ii as a current value at a predetermined timing (for example, a peak value Ip which is a current value when a certain time T (═ T/2) has elapsed from a timing of a rising edge of the waveform).
The reason why the comparison threshold Vthc used in the service life determination unit 10 should be updated is as follows. That is, the ripple amplitude value Vpp changes not only due to aging of the capacitor 6d but also due to a variation in the supplied power due to a variation in the load LD. Therefore, in order to accurately determine the deterioration of the capacitor 6d, the comparison threshold Vthc must be adjusted according to the supplied power.
The service life determination unit 10 compares the differential voltage value Vdi (the pulsation amplitude value Vpp1 in this example) with a comparison threshold Vthc, and determines that the service life of the capacitor 6d has been reached when the pulsation amplitude value Vpp1 reaches the comparison threshold Vthc, as will be described later. Therefore, when the pulsation amplitude value Vpp1 fluctuates due to the fluctuation of the load LD in a state where the deterioration of the capacitor 6d is not progressed to the extent that it is considered that the service life has been reached, the threshold updating unit 9 updates the comparison threshold Vthc used in the service life determination unit 10 to the threshold corresponding to the lightness of the load LD (that is, the threshold corresponding to the magnitude of the current value of the supplied power or the inflow current Ii) so that the service life determination unit 10 does not erroneously determine that the service life of the capacitor 6d has been reached.
A mode in which the threshold updating unit 9 calculates a new threshold will be described. Further, under the condition that the load LD is fixed (that is, the power supplied to the load LD and the inflow current Ii are fixed), the threshold updating unit 9 calculates in advance, by simulation or the like, an increase in the pulsation amplitude value Vpp from the time when the capacitor 6d is in a state where aging is not present (initial state) until the time when the aging progresses and the service life is reached, and stores the increase as an increase Δ Vppr (fixed value).
First, the threshold updating unit 9 calculates the input power to the power factor correction circuit unit 6 based on the detected voltage value of the input voltage Vi and the current value of the inflow current Ii. In order to facilitate understanding of the present invention, when the power loss of the power factor correction circuit unit 6 is made zero, the calculated input power can be regarded as equivalent to the supply power supplied from the power factor correction circuit unit 6 to the load LD. The pulsation amplitude value Vpp also fluctuates substantially in proportion to the fluctuation of the supplied power. Therefore, based on the calculated input power, the threshold updating unit 9 calculates, as a pulsation amplitude value Vpp2 (theoretical value), a pulsation amplitude value Vpp predicted to be generated in the capacitor 6d at the time of the input power, in the same manner as when the pulsation amplitude value Vpp of fig. 3 is calculated.
As described above, the ripple amplitude value Vpp changes substantially in proportion to the change in the current value of the inflow current Ii when the input voltage Vi (ac input voltage Vac) is fixed. Therefore, the threshold updating unit 9 may be configured to calculate the ripple amplitude value Vpp2 predicted to occur in the capacitor 6d at the detected current value of the inflow current Ii in consideration of the detected voltage value of the input voltage Vi. In this configuration, for example, a reference table (a table in which the pulsation amplitude value Vpp2 at each current value when the current value of the inflow current Ii is changed is stored for each input voltage Vi) is created in advance by removing the column of the supplied power from the table shown in fig. 3, and stored in the threshold updating unit 9. In this state, the threshold updating unit 9 newly specifies (calculates) the ripple amplitude value Vpp2 corresponding to the detected voltage value of the input voltage Vi (ac input voltage Vac) among the ripple amplitude values Vpp (in this case, the ripple amplitude values Vpp2) corresponding to the current values of the inflow current Ii for each voltage value of the input voltage Vi (ac input voltage Vac) (for example, 100V and 200V in fig. 3).
Specifically, for example, as shown in fig. 3, when the reference table is described using an example in which the values of the input voltage Vi (ac input voltage Vac), the inflow current Ii, and the ripple amplitude value Vpp2 are stored in association with each other, the threshold updating unit 9 newly determines (calculates), when the detected voltage value of the input voltage Vi is 100V and the detected current value of the inflow current Ii is 0.39A, the ripple amplitude value Vpp2(4.5V ripple amplitude value Vpp2 when the input voltage Vi is 100V and 9.0V ripple amplitude value Vpp2 when the input voltage Vi is 200V) corresponding to the current value (0.39A) of the inflow current Ii existing for each voltage value (100V, 200V) of the input voltage Vi (ac input voltage Vac) and corresponding to the voltage value (100V) of the detected input voltage Vi (ac input voltage Vac) among the ripple amplitude values Vpp2(4.5V) newly determined (calculated).
Next, the threshold updating unit 9 determines (calculates) a value (Vpp2+ Δ Vppr) obtained by adding the above-described increase Δ Vppr to the pulsation amplitude value Vpp2 (theoretical value) determined (calculated) as described above as a new threshold, outputs the new threshold to the service life determination unit 10 as the comparison threshold Vthc, and updates the comparison threshold Vthc used by the service life determination unit 10.
The threshold updating unit 9 may be configured to use, as a threshold table, a table in which a value obtained by adding the increment Δ Vppr to each pulsation amplitude value Vpp2 (that is, a threshold) is stored, instead of each pulsation amplitude value Vpp2 in the above-described reference table. In this configuration, the threshold updating unit 9 can directly specify (calculate), as a new threshold (new comparison threshold Vthc), a threshold corresponding to the detected voltage value of the input voltage Vi (ac input voltage Vac) among the thresholds corresponding to the current values of the inflow current Ii for each voltage value of the input voltage Vi (ac input voltage Vac).
The service life determination unit 10 compares the differential voltage value Vdi (the pulse amplitude value Vpp1 in the present example) output from the differential voltage detection unit 8 with a predetermined comparison threshold Vthc, and outputs a report signal Sd for reporting the service life of the capacitor 6d when the differential voltage value Vdi reaches the comparison threshold Vthc. The service life determination unit 10 uses the comparison threshold Vthc (Vpp2+ Δ Vppr) output from the threshold update unit 9 for the comparison threshold Vthc. With this configuration, the service life determination unit 10 updates and uses the comparison threshold Vthc each time a new comparison threshold Vthc is output from the threshold update unit 9.
The converter 11 is composed of, for example, an insulation type DC/DC converter having an insulation transformer 11a, and converts the DC voltage Vo output from the power factor correction circuit unit 6 into a DC output voltage Vout for the load LD and outputs the DC output voltage Vout. The smoothing unit 12 is configured by a low-pass filter or the like, removes high-frequency components such as switching noise included in the dc output voltage Vout, and outputs the dc output voltage Vout from which the noise is removed to the load LD through a pair of output terminals 13a and 13 b.
Next, the operation of the power supply device 1A will be described. In addition, as an example, an input voltage Vi (ac input voltage Vac) having a fixed effective value is supplied to the input terminals 2a and 2b, and the load LD connected to the output terminals 13a and 13b is initially operated in a rated state (a state of receiving a supply of normal supply power from the power supply device 1A).
In the power supply device 1A, the primary-side rectifying unit 3 full-wave rectifies the ac input voltage Vac to be input to the input terminals 2a and 2b and outputs the rectified voltage Vac as an input voltage Vi to the power factor correction circuit unit 6, and the power factor correction circuit unit 6 performs a voltage stabilizing operation of generating a dc voltage Vo based on the input voltage Vi and stabilizing a target voltage Vtg and a power factor correcting operation of matching the waveform of the inflow current Ii with the waveform of the input voltage Vi in parallel. The converter 11 converts the dc voltage Vo output from the power factor correction circuit unit 6 into a dc output voltage Vout for the load LD and outputs the dc output voltage Vout, and the smoothing unit 12 removes high-frequency components such as switching noise included in the dc output voltage Vout and outputs the dc output voltage Vout, from which the noise is removed, to the load LD through a pair of output terminals 13a and 13 b.
In the power supply device 1A, the input voltage detector 4 detects the input voltage Vi, outputs the input voltage detection signal Sv1 to the threshold value updater 9, and the current detector 5 detects the inflow current Ii and outputs the current detection signal Si to the threshold value updater 9. The output voltage detection unit 7 detects the dc voltage Vo, and outputs an output voltage detection signal Sv2 to the differential voltage detection unit 8.
The differential voltage detection unit 8 detects the ripple amplitude value Vpp1 of the dc voltage Vo based on the output voltage detection signal Sv2, and outputs the detected value as the differential voltage value Vdi. In this case, the detected ripple amplitude value Vpp1 is obtained by adding the current time increment Δ Vppc due to aging of the capacitor 6d to the ripple amplitude value Vppa corresponding to the magnitude of the power supplied from the power factor correction circuit unit 6 to the load LD (Vpp1 is Vppa + Δ Vppc).
The threshold updating section 9 first detects the voltage value of the input voltage Vi (ac input voltage Vac) based on the input voltage detection signal Sv1, and detects the current value of the inflow current Ii based on the current detection signal Si. Next, the threshold updating unit 9 calculates the input power to the power factor correction circuit unit 6 (equivalently, the power supplied from the power factor correction circuit unit 6 to the load LD) based on the detected voltage value of the input voltage Vi and the current value of the inflow current Ii. Then, based on the calculated supply power, the threshold updating unit 9 calculates a ripple amplitude value Vpp2 (theoretical value) in the capacitor 6d generated in accordance with the supply power in a state where the supply power is supplied from the power factor correction circuit unit 6 to the load LD. The threshold updating unit 9 determines (calculates) a new threshold (Vpp2+ Δ Vppr) obtained by adding the increment Δ Vppr to the calculated pulsation amplitude value Vpp2, and outputs the new threshold to the useful life determination unit 10 as the comparison threshold Vthc, thereby updating the comparison threshold Vthc used by the useful life determination unit 10.
The service life determination unit 10 compares the differential voltage value Vdi (the ripple amplitude value Vpp1(═ Vppa + Δ Vppc)) output from the differential voltage detection unit 8 with the new comparison threshold value Vthc (═ Vpp2+ Δ Vppr) output from the threshold value update unit 9, and outputs a report signal Sd for reporting the service life of the capacitor 6d when the differential voltage value Vdi reaches the comparison threshold value Vthc.
In this case, as described above, the pulsation amplitude value Vpp2 constituting the comparison threshold Vthc is a theoretical value of the pulsation amplitude value Vpp generated in the capacitor 6d according to the supply power supplied from the power factor correction circuit unit 6 to the load LD at the present time, and therefore can be regarded as substantially the same value as the pulsation amplitude value Vppa constituting the pulsation amplitude value Vpp1 (the pulsation amplitude value Vpp (actually measured value) at the present time according to the magnitude of the supply power actually supplied from the power factor correction circuit unit 6 to the load LD). That is, it can be considered that the relationship of the pulsation amplitude value Vpp2 ≈ the pulsation amplitude value Vppa holds.
Thus, the service life determination unit 10 compares the difference voltage value Vdi (the ripple amplitude value Vpp1(═ Vppa + Δ Vppc)) with the comparison threshold Vthc (═ Vpp2+ Δ Vppr), and compares the current time increase Δ Vppc due to aging of the capacitor 6d with the current time increase Δ Vppr of the ripple amplitude value Vpp that reaches the service life since aging has progressed in the state where aging of the capacitor 6d has never occurred in the state where aging of the capacitor 6d has not occurred, in a state where the influence of the ripple amplitude value Vpp generated in the capacitor 6d according to the supplied power is greatly reduced (almost unaffected by the ripple amplitude value Vpp generated in the capacitor 6d according to the supplied power).
Therefore, the service life determination unit 10 compares the difference voltage value Vdi (the ripple amplitude value Vpp1(═ Vppa + Δ Vppc)) with the comparison threshold Vthc (═ Vpp2+ Δ Vppr), and does not output the report signal Sd for reporting the service life of the capacitor 6d when the ripple amplitude value Vpp1 indicated by the difference voltage value Vdi does not reach the comparison threshold Vthc (which corresponds to the case where the above-described increase Δ Vppc does not reach the above-described increase Δ Vppr, that is, when the service life of the capacitor 6d does not reach the end).
On the other hand, the lifetime determination unit 10 compares the differential voltage value Vdi (pulsation amplitude value Vpp2) with the comparison threshold Vthc, and outputs a report signal Sd for reporting the lifetime of the capacitor 6d when the pulsation amplitude value Vpp1 reaches the comparison threshold Vthc (which corresponds to when the above-described increase Δ Vppc reaches the above-described increase Δ Vppr, that is, when the lifetime of the capacitor 6d is reached). In this case, the control circuit detects the output of the report signal Sd in the power factor correction circuit unit 6, and stops the pulse width control of the switching element 6 c. Thereby, the power factor correction circuit unit 6 stops the voltage stabilization operation and the power factor correction operation. Therefore, in the power supply device 1A, the capacitor 6d having reached the end of its service life can be prevented from being used continuously.
As described above, in the power supply device 1A of the present example, the threshold updating unit 9 identifies (calculates) a threshold corresponding to the input power (corresponding to the power supplied from the power factor correction circuit unit 6 to the load LD) to the power factor correction circuit unit 6, which is calculated from the voltage value of the input voltage Vi detected based on the input voltage detection signal Sv1 and the current value of the inflow current Ii detected based on the current detection signal Si, and outputs the threshold to the useful life determination unit 10 as the comparison threshold Vthc, thereby updating the comparison threshold Vthc used by the useful life determination unit 10.
Therefore, according to the power supply device 1A, by comparing the differential voltage value Vdi (the pulsation amplitude value Vpp1) with the comparison threshold Vthc, it is possible to more accurately detect (determine) whether or not the service life of the capacitor 6d has been reached by comparing the increase Δ Vppc at the present time due to the aging of the capacitor 6d with the increase Δ Vppr of the pulsation amplitude value Vpp from the time when the aging of the capacitor 6d has not occurred to the time when the aging has progressed and reached the service life in a state where the influence of the pulsation amplitude value Vpp generated in the capacitor 6d according to the supplied power is greatly reduced (in other words, almost not affected by the pulsation amplitude value Vpp generated in the capacitor 6d according to the supplied power).
In addition, according to the power supply apparatus 1A, when the service life determination unit 10 outputs the report signal Sd that has reached the service life of the capacitor 6d, the power factor correction circuit unit 6 stops the pulse width control of the switching element 6c (i.e., stops the switching operation of the switching element 6 c), and thus it is possible to avoid a state in which the capacitor 6d that has reached the service life is continuously used. Although not shown, the following configuration may be adopted instead of or in addition to the above-described configuration in which the power factor correction circuit section 6 stops the switching operation of the switching element 6c when outputting the report signal Sd: the power supply device 1A is provided with an output unit (a display device such as a display, or an audio output device such as a speaker or a buzzer), and when outputting the report signal Sd, the output unit reports to the outside that the service life of the capacitor 6d has been reached (when the output unit is a display device, a display indicating that the service life has been reached is displayed, and when the output unit is an audio output device, a sound indicating that the service life has been reached is emitted).
Instead of the configuration in which the threshold value is determined (calculated) in accordance with the input power to the power factor correction circuit unit 6 (equivalently, the power supplied from the power factor correction circuit unit 6 to the load LD) calculated from the voltage value of the input voltage Vi detected based on the input voltage detection signal Sv1 and the current value of the inflow current Ii detected based on the current detection signal Si, the threshold value update unit 9 may be configured to determine (calculate) the threshold value in accordance with the current value of the inflow current Ii detected based on the current detection signal Si as described above when the voltage value of the input voltage Vi (ac input voltage Vac) is fixed. For example, since the commercial ac voltage that is daily used as the ac input voltage Vac in this example is constant (fixed) in each country, this configuration can be adopted when the country in which the power supply device 1A is used is limited. In addition, the same effects as those described above (the effect of more accurately determining whether or not the service life of the capacitor 6d has been reached) can be obtained in the power supply device 1A having this configuration.
In the case of adopting this configuration (a configuration in which the threshold is determined (calculated) in accordance with the current value of the inflow current Ii), it is preferable that the power supply apparatus 1A be configured so as to be usable in countries having different commercial ac voltages (ac input voltage Vac in this example). This configuration can be realized by employing a configuration in which the threshold updating unit 9 uses the above-described reference table and threshold table. In the configuration using this reference table, the threshold updating unit 9 newly specifies (calculates) a ripple amplitude value Vpp2 corresponding to the detected voltage value of the input voltage Vi (ac input voltage Vac) from among the ripple amplitude values Vpp2 corresponding to the current value of the inflow current Ii for each voltage value of the input voltage Vi (ac input voltage Vac), and adds the increment Δ Vppr to the ripple amplitude value Vpp2 to calculate a new threshold (comparison threshold Vthc). In the configuration using the above-described threshold value table, the threshold value update unit 9 directly specifies (calculates), as a new threshold value (comparison threshold value Vthc), a threshold value corresponding to the detected voltage value of the input voltage Vi (ac input voltage Vac) among threshold values corresponding to the current values of the inflow current Ii for each voltage value of the input voltage Vi (ac input voltage Vac). Thus, even when a commercial ac voltage (ac input voltage Vac in the present example) having a different voltage value is input, the power supply device 1A can calculate a new threshold (comparison threshold Vthc) accurately corresponding to the voltage value of the commercial ac voltage (ac input voltage Vac in the present example) and the current value of the inflow current Ii.
In the power supply device 1A, the input voltage detection unit 4 is provided between the primary-side rectification unit 3 and the power factor correction circuit unit 6, and the voltage value of the input voltage Vi to the power factor correction circuit unit 6 is detected. For example, the following structure can be adopted: as in the power supply apparatus 1B shown in fig. 5, another primary-side rectifying unit 21 connected to the input terminals 2a and 2B in parallel with the primary-side rectifying unit 3 via a pair of power supply lines 73 and 74 is provided, and the input voltage detecting unit 4 detects a voltage Vix (a voltage equivalent to the input voltage Vi) output by full-wave rectifying the ac input voltage Vac by the primary-side rectifying unit 21 and outputs an input voltage detection signal Sv 1. In addition, since the other configurations are denoted by the same reference numerals as the power supply device 1A, redundant description is omitted.
The input voltage detection signal Sv1 in the power supply device 1B is the same as the input voltage detection signal Sv1 described above in the power supply device 1A. Therefore, the same effects as those of the power supply device 1A described above can be obtained also in the power supply device 1B.
The power supply devices 1A and 1B described above can be used in a medical system by connecting medical equipment as a load LD to the output terminals 13a and 13B. Hereinafter, an example of using the power supply device 1A will be described, and the same applies to the case of using the power supply device 1B.
The medical system MES1 including the power supply device 1A will be described below with reference to fig. 6. In addition, the insulation transformer 11A provided in the converter 11 of the power supply device 1A has insulation performance (reinforced insulation) that meets medical standards. An FG line for grounding is connected to the case H of the power supply device 1A. The medical device operates as the load LD based on the dc output voltage Vout, which is the load voltage output from the power supply device 1A. Note that the same components as those of the power supply device 1A described above are denoted by the same reference numerals, and redundant description thereof is omitted. In fig. 6, the output voltage detection unit 7, the differential voltage detection unit 8, the threshold update unit 9, and the service life determination unit 10 are not shown.
In this case, the power supply apparatus 1A operates by receiving an ac input voltage Vac supplied from between input lines (L-phase line and N-phase line) through a pair of input terminals 2a and 2 b. Therefore, the power supply device 1A is provided with a fuse 76 (or a circuit breaker) inserted in the pair of power lines 73, 74.
According to the medical system MES1 including the power supply apparatus 1A, since the power supply apparatus 1A has a configuration in which the insulation transformer 11A and the fuse 76 having enhanced insulation are provided as described above and the medical standards can be individually obtained, the configuration in which the medical standards can be obtained can be realized without interposing the insulation transformer and the fuse (or the breaker) outside the power supply apparatus 1A (specifically, the input lines (L-phase lines and N-phase lines) connected to the power supply apparatus 1A). Further, according to the medical system MES1, the effect of the single power supply device 1A can be obtained by providing the power supply device 1A.
In the medical system MES1, the power supply device 1A may be provided with the fuse 76 (or the breaker) therein, and the medical system may be configured using the power supply device 1A not provided with the fuse 76 (or the breaker) therein. The medical system MES2 having this configuration will be described below with reference to fig. 7. Note that the same components as those of the medical system MES1 are denoted by the same reference numerals, and overlapping descriptions are omitted, and the components different from those of the medical system MES1 will be mainly described.
In the medical system MES2, the fuse 76 (or circuit breaker) is inserted into the input lines (L-phase line, N-phase line) as shown in fig. 7. According to this configuration, an ac input voltage Vac supplied from between the input lines (L-phase line, N-phase line) is input to the input terminals 2a, 2b of the power supply apparatus 1A via the fuse 76 (or circuit breaker).
According to the medical system MES2 including the power supply device 1A, since the power supply device 1A includes the insulation transformer 11A with enhanced insulation as described above, a configuration capable of obtaining the medical standard can be realized only by inserting the fuse 76 (or the breaker) outside the power supply device 1A (specifically, the input lines (L-phase line, N-phase line) connected to the power supply device 1A). Further, according to the medical system MES2, the effect of the single power supply device 1A can be obtained by providing the power supply device 1A.
In the medical systems MES1 and MES2, the fuse 76 (or the circuit breaker) may be inserted only inside or outside the power supply device 1A, or the fuse 76 (or the circuit breaker) may be inserted inside or outside the power supply device 1A. The medical system MES3 having this configuration will be described below with reference to fig. 8. Note that the same components as those of the above-described medical systems MES1 and MES2 are denoted by the same reference numerals, and overlapping descriptions are omitted, and the components different from those of the medical systems MES1 and MES2 will be mainly described.
In the medical system MES3, the power supply device 1A is internally provided with one power supply line (in this example, the power supply line 74) inserted in the pair of power supply lines 73 and 74 as a second power supply lineFuse 76 of 1-fuse1(or a circuit breaker as the 1 st circuit breaker). Further, a fuse 76 as a 2 nd fuse is provided outside the power supply device 1A in a state of being inserted into an input line (in this example, an L-phase line) connected to the other power line (in this example, the power line 73) of the pair of power lines 73 and 74 through an input terminal (in this example, the input terminal 2a)2(or a circuit breaker as a 2 nd circuit breaker). Although not shown, the following configuration can be adopted: fuse 76 to be the 1 st fuse1(or 1 st breaker) is inserted into the power line 73, and a fuse 76 as a 2 nd fuse is inserted in correspondence with the power line2(or the circuit breaker of the 2 nd circuit breaker) is inserted in the N phase line.
According to the medical system MES3 including the power supply device 1A, the power supply device 1A is provided with the insulation transformer 11A having enhanced insulation and the fuse 76 inserted in one power line (the power line 74 or the power line 73) as described above1(circuit breaker), therefore, it is possible to insert other fuse 76 only by inserting the other fuse 76 outside power supply device 1A (specifically, an input line (L-phase line or N-phase line) connected to the other power supply line among input lines (L-phase line, N-phase line) connected to power supply device 1A)2(or circuit breaker) a structure that can achieve medical standards is realized. Further, according to the medical system MES3, the effect of the single power supply device 1A can be obtained by providing the power supply device 1A.
Description of reference numerals
1A, 1B power supply device
4 input voltage detection unit
5 Current detecting part
6 power factor correction circuit part
6c switching element
6d capacitor
7 output voltage detection unit
8 differential voltage detection unit
9 threshold value update unit
10 service life determination part
Ii inflow current
Sd report signal
Si current detection signal
Sv2 output voltage detection signal
Vdi differential voltage value
Vi input voltage
Vo DC voltage
Threshold for Vthc comparison

Claims (9)

1. A power supply device is characterized in that,
the disclosed device is provided with:
a power factor correction circuit unit including an inductor, a diode, a switching element, and a capacitor, for converting an input voltage obtained by rectifying an alternating-current voltage into a direct-current voltage and outputting the direct-current voltage;
a current detection unit that detects an inflow current flowing into the power factor correction circuit unit and outputs a current detection signal;
an output voltage detection unit that detects the dc voltage and outputs an output voltage detection signal;
a differential voltage detection unit that detects any one of a differential voltage value between a maximum value and a minimum value of a ripple component of the dc voltage detected from the output voltage detection signal, a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the maximum value and a voltage value of a target voltage of the dc voltage, and a differential voltage value between the voltage value of the dc voltage at a timing when the ripple component reaches the minimum value and the voltage value of the target voltage;
a service life determination unit that compares the one of the differential voltage values with a predetermined comparison threshold value and reports the service life of the capacitor when the differential voltage value reaches the comparison threshold value; and
and a threshold updating unit that updates the comparison threshold to a threshold corresponding to a current value of the inflow current detected based on the current detection signal.
2. The power supply device according to claim 1,
includes an input voltage detection unit for detecting a voltage obtained by rectifying the AC voltage and outputting an input voltage detection signal,
the threshold updating unit updates the comparison threshold to a threshold corresponding to the voltage value of the ac voltage detected based on the input voltage detection signal among the thresholds corresponding to the current values of the inflow current for each voltage value of the ac voltage.
3. A power supply device is characterized in that,
the disclosed device is provided with:
a power factor correction circuit unit including an inductor, a diode, a switching element, and a capacitor, for converting an input voltage obtained by rectifying an alternating-current voltage into a direct-current voltage and outputting the direct-current voltage;
an input voltage detection unit that detects a voltage obtained by rectifying the ac voltage and outputs an input voltage detection signal;
a current detection unit that detects an inflow current flowing into the power factor correction circuit unit and outputs a current detection signal;
an output voltage detection unit that detects the dc voltage and outputs an output voltage detection signal;
a differential voltage detection unit that detects any one of a differential voltage value between a maximum value and a minimum value of a ripple component of the dc voltage detected from the output voltage detection signal, a differential voltage value between a voltage value of the dc voltage at a timing when the ripple component reaches the maximum value and a voltage value of a target voltage of the dc voltage, and a differential voltage value between the voltage value of the dc voltage at a timing when the ripple component reaches the minimum value and the voltage value of the target voltage;
a service life determination unit that compares the one of the differential voltage values with a predetermined comparison threshold value and reports the service life of the capacitor when the differential voltage value reaches the comparison threshold value; and
and a threshold updating unit that updates the comparison threshold to a threshold corresponding to the input power calculated from the current value of the inflow current detected based on the current detection signal and the voltage value of the ac voltage detected based on the input voltage detection signal.
4. The power supply device according to claim 1,
the power factor correction circuit unit stops the switching operation of the switching element when the service life determination unit reports that the service life has been reached.
5. The power supply device according to claim 2,
the power factor correction circuit unit stops the switching operation of the switching element when the service life determination unit reports that the service life has been reached.
6. The power supply device according to claim 3,
the power factor correction circuit unit stops the switching operation of the switching element when the service life determination unit reports that the service life has been reached.
7. A medical treatment system, characterized in that,
the disclosed device is provided with:
the power supply device according to any one of claims 1 to 6, comprising a pair of input terminals connected to an input line, a primary-side rectifying section connected to the pair of input terminals through a pair of power supply lines and rectifying the alternating-current voltage input through the input line, the pair of input terminals, and the pair of power supply lines to output the input voltage to the power factor correction circuit section as the input voltage, an insulation type DC/DC converter generating a load voltage from the direct-current voltage and outputting the load voltage to a corresponding load, and a fuse or a circuit breaker inserted in the pair of power supply lines; and
and a medical device connected to the insulation type DC/DC converter as the load and operating based on the load voltage.
8. A medical treatment system, characterized in that,
the disclosed device is provided with:
the power supply device according to any one of claims 1 to 6, comprising a pair of input terminals connected to an input line, a primary-side rectifying section connected to the pair of input terminals and rectifying the alternating-current voltage input through the input line and the pair of input terminals to output as the input voltage to the power factor correction circuit section, and an insulation type DC/DC converter generating from the direct-current voltage and outputting to a load voltage of a corresponding load;
the fuse or the breaker is inserted in the input line; and
and a medical device connected to the insulation type DC/DC converter as the load and operating based on the load voltage.
9. A medical treatment system, characterized in that,
the disclosed device is provided with:
the power supply device according to any one of claims 1 to 6, comprising a pair of input terminals connected to an input line, a primary-side rectifying portion connected to the pair of input terminals through a pair of power supply lines and rectifying the alternating-current voltage input through the input line, the pair of input terminals, and the pair of power supply lines to output the input voltage to the power factor correction circuit portion as the input voltage, an insulation type DC/DC converter generating a load voltage from the direct-current voltage and outputting the load voltage to a corresponding load, and a 1 st fuse or a 1 st circuit breaker inserted in one of the pair of power supply lines;
a 2 nd fuse or a 2 nd circuit breaker inserted in the input line connected to the other of the pair of power lines through the input terminal; and
and a medical device connected to the insulation type DC/DC converter as the load and operating based on the load voltage.
CN202010206937.XA 2019-03-25 2020-03-23 Power supply device and medical system Active CN111740620B (en)

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JP7338189B2 (en) 2023-09-05

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